public class E2_3 {
	public static void main (String args[]) {
	  long[] a = {1,2,3,4};
	  long[] b = {100,200,300,400};
	  b = a;
	  System.out.println("数组b的长度:"+b.length);
	  System.out.println("b[0]="+b[0]);
	}
}